<template>
  <div class="upload-container">
    <el-button
      :style="{ background: color, borderColor: color }"
      icon="el-icon-upload"
      size="mini"
      type="primary"
      @click="dialogVisible = true"
    >
      upload
    </el-button>
    <el-dialog v-model:visible="dialogVisible">
      <el-upload
        :multiple="true"
        :file-list="fileList"
        :show-file-list="true"
        :on-remove="handleRemove"
        :on-success="handleSuccess"
        :before-upload="beforeUpload"
        class="editor-slide-upload"
        action="https://httpbin.org/post"
        list-type="picture-card"
      >
        <el-button size="small" type="primary"> Click upload </el-button>
      </el-upload>
      <el-button @click="dialogVisible = false"> Cancel </el-button>
      <el-button type="primary" @click="handleSubmit"> Confirm </el-button>
    </el-dialog>
  </div>
</template>

<script>
// import { getToken } from 'api/qiniu'

export default {
  name : 'EditorSlideUpload',
  props : {
    color : {
      type : String,
      default : '#1890ff'
    }
  },
  data() {
    return {
      dialogVisible : false,
      listObj : {},
      fileList : []
    }
  },
  methods : {
    checkAllSuccess() {
      return Object.keys( this.listObj ).every( item => this.listObj[item].hasSuccess )
    },
    handleSubmit() {
      const arr = Object.keys( this.listObj ).map( v => this.listObj[v] )
      if ( !this.checkAllSuccess() ) {
        this.$message(
          'Please wait for all images to be uploaded successfully. If there is a network problem, please refresh the page and upload again!'
        )
        return
      }
      this.$emit( 'successCBK', arr )
      this.listObj = {}
      this.fileList = []
      this.dialogVisible = false
    },
    handleSuccess( response, file ) {
      const uid = file.uid
      const objKeyArr = Object.keys( this.listObj )
      for ( let i = 0, len = objKeyArr.length; i < len; i++ ) {
        if ( this.listObj[objKeyArr[i]].uid === uid ) {
          this.listObj[objKeyArr[i]].url = response.files.file
          this.listObj[objKeyArr[i]].hasSuccess = true
          return
        }
      }
    },
    handleRemove( file ) {
      const uid = file.uid
      const objKeyArr = Object.keys( this.listObj )
      for ( let i = 0, len = objKeyArr.length; i < len; i++ ) {
        if ( this.listObj[objKeyArr[i]].uid === uid ) {
          delete this.listObj[objKeyArr[i]]
          return
        }
      }
    },
    beforeUpload( file ) {
      const _self = this
      const _URL = window.URL || window.webkitURL
      const fileName = file.uid
      this.listObj[fileName] = {}
      return new Promise( ( resolve, reject ) => {
        const img = new Image()
        img.src = _URL.createObjectURL( file )
        img.onload = function() {
          _self.listObj[fileName] = {
            hasSuccess : false,
            uid : file.uid,
            width : this.width,
            height : this.height
          }
        }
        resolve( true )
      } )
    }
  }
}
</script>

<style lang="scss" scoped>
.editor-slide-upload {
  margin-bottom: 20px;
  :deep(.el-upload--picture-card) {
    width: 100%;
  }
}
</style>
